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The octet-baryon axial-vector charges and the g1/f1 ratios measured in thesemileptonic hyperon decays are studied up to O(p^3) using the covariant baryonchiral perturbation theory with explicit decuplet contributions. We clarify therole of different low-energy constants and find a good convergence for thechiral expansion of the axial-vector charges of the baryon octet, g1(0), withO(p^3) corrections typically around 20% of the leading ones. This is aconsequence of strong cancellations between different next-to-leading orderterms. We show that considering only non-analytic terms is not enough and thatanalytic terms appearing at the same chiral order play an important role inthis description. The same effects still hold for the chiral extrapolation ofthe axial-vector charges and result in a rather mild quark-mass dependence. Asa result, we report a determination of the leading order chiral couplings,D=0.623(61)(17) and F=0.441(47)(2), as obtained from a completely consistentchiral analysis up to O(p^3). Furthermore, we note that the appearance of anunknown low-energy constant precludes the extraction of the proton octet-chargefrom semileptonic decay data alone, which is relevant for an analysis of thecomposition of the proton spin.

Octet-baryon axial-vector charges and SU(3)-breaking effects in the semileptonic hyperon decays